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Introduction to Linux - A Hands on Guide

This guide was created as an overview of the Linux Operating System, geared toward new users as an exploration tour and getting started guide, with exercises at the end of each chapter.
For more advanced trainees it can be a desktop reference, and a collection of the base knowledge needed to proceed with system and network administration. This book contains many real life examples derived from the author's experience as a Linux system and network administrator, trainer and consultant. They hope these examples will help you to get a better understanding of the Linux system and that you feel encouraged to try out things on your own.

I have installed postfix in my ubuntu server and i am trying to blacklist a specific email address to a specific user or the whole domain itself. Is there a work around on this. I've searched google and i found this...

There is nothing confidential or compromising in your postconf -n output. It is standard, required practice on the postfix mailing list.

I'm summarizing here for others to learn as well:

Your postconf output does not match your early statements, so we'll just ignore those. This is why postconf -n output is mandatory. My comments follow below a section or line. I've added those lines in blue; you should remove things in red.

So those are some ways to reject mail from client IP or hostname, or sender email or domain and/or subdomains. If you use hash maps, be sure to postmap the file after done (but not for regexp/pcre maps)